underscore应用
Tjhfsghbjknjdy 2015-10-28
判断一个对象数组是否包含某个对象，可以用underscore的方法判断，代码简洁易懂。如contains、indexOf、find、findWhere，需要说明的是contains和indexOf使用===检测。简单实例如下：
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8" />
<meta name="author" content="@my_coder">
<meta name="viewport"
content="width=device-width, initial-scale=1.0, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
<title>underscore</title>
</head>
<body>
<script type="text/javascript" src="underscore.js"></script>
<script>
var testList = [];
testList.push({name:'zhangshan',age:18});
testList.push({name:'lisi',age:28});
testList.push({name:'wangwu',age:38});
testList.push({name:'xiaomazi',age:88});
//var res1 = _.contains(testList, {name:'zhangshan',age:18});
var res1 = _.indexOf(testList, {name:'zhangshan',age:18});
console.log("res1:" + res1); //res1:-1
var t = {name:'zhangshan0',age:16};
var res4 = _.findWhere(testList, t);
console.log("res4:" + res4); //res4:undefined
if(!res4) {
testList.push(t);
}
console.log(testList);
var testList2 = [];
var obj1 = {name:'zhangshan',age:18};
var obj2 = {name:'lisi',age:28};
var obj3 = {name:'wangwu',age:38};
var obj4 = {name:'xiaomazi',age:88};
testList2.push(obj1);
testList2.push(obj2);
testList2.push(obj3);
testList2.push(obj4);
//var res2 = _.contains(testList2, obj1);
var res2 = _.indexOf(testList2, obj1);
console.log("res2:" + res2); //res2:0
var res3 = _.find(testList, function(obj){ return obj.name == 'zhangshan'; });
console.log("res3:" + res3); //res3:[object Object]
</script>
</body>
</html>Underscore.js中文文档地址：http://www.css88.com/doc/underscore/
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